Elastic Interaction

1
Elastic Interaction and Creep Relaxation in
Gasketed Joints
Dr. Sayed A. Nassar, AdvisorAli A. Alkelani

• Objective This Ph.D. research investigates the
  factors that affect the clamp load in
• gasketed bolted joints
• Research Methodology
• Investigate the clamp load loss due to
  elastic interaction and creep relaxation in
  gasketed joints
• Study the effect of gasket material on
  elastic interaction between fasteners
• Identify the parameters that affect the
  elastic interaction
• Use precision fastening systems and force
  washers to develop Torque-Tension correlation
• Parameters Considered
• Gasket material
• Gasket thickness
• Bolt spacing
• Tightening pattern sequential, star, and
  simultaneous
• Fastener preload level
• Fastener grip length
• Tightening speed

Real Time Elastic Interaction and
Portable Tightening System
Real Time Elastic Interaction Gasket
Creep Relaxation (Soft Gasket) Start
and Sequential patterns
(Hard Gasket)
1
5 2
4 3
Test Setup
Torque vs. Time
Five Spindle DC Tool